1 // SPDX-License-Identifier: GPL-2.0-only
3  * rtc-mrst.c: Driver for Moorestown virtual RTC
15  * This driver is based upon drivers/rtc/rtc-cmos.c
37 #include <asm/intel-mid.h>
72  * rtc_time's year contains the increment over 1900, but vRTC's YEAR
74  * driver chose to use 1972 (1970 is UNIX time start point) as the base,
78  * make it consistent in leap year setting for both vrtc and low-level
80  * 1960, for a device's first use, its YEAR register is 0 and the system
81  * year will be parsed as 1960 which is not a valid UNIX time and will
92 	time->tm_sec = vrtc_cmos_read(RTC_SECONDS);  in mrst_read_time()
93 	time->tm_min = vrtc_cmos_read(RTC_MINUTES);  in mrst_read_time()
94 	time->tm_hour = vrtc_cmos_read(RTC_HOURS);  in mrst_read_time()
95 	time->tm_mday = vrtc_cmos_read(RTC_DAY_OF_MONTH);  in mrst_read_time()
96 	time->tm_mon = vrtc_cmos_read(RTC_MONTH);  in mrst_read_time()
97 	time->tm_year = vrtc_cmos_read(RTC_YEAR);  in mrst_read_time()
101 	time->tm_year += 72;  in mrst_read_time()
102 	time->tm_mon--;  in mrst_read_time()
113 	yrs = time->tm_year;  in mrst_set_time()
114 	mon = time->tm_mon + 1;   /* tm_mon starts at zero */  in mrst_set_time()
115 	day = time->tm_mday;  in mrst_set_time()
116 	hrs = time->tm_hour;  in mrst_set_time()
117 	min = time->tm_min;  in mrst_set_time()
118 	sec = time->tm_sec;  in mrst_set_time()
121 		return -EINVAL;  in mrst_set_time()
122 	yrs -= 72;  in mrst_set_time()
144 	if (mrst->irq <= 0)  in mrst_read_alarm()
145 		return -EIO;  in mrst_read_alarm()
149 	t->time.tm_sec = vrtc_cmos_read(RTC_SECONDS_ALARM);  in mrst_read_alarm()
150 	t->time.tm_min = vrtc_cmos_read(RTC_MINUTES_ALARM);  in mrst_read_alarm()
151 	t->time.tm_hour = vrtc_cmos_read(RTC_HOURS_ALARM);  in mrst_read_alarm()
156 	t->enabled = !!(rtc_control & RTC_AIE);  in mrst_read_alarm()
157 	t->pending = 0;  in mrst_read_alarm()
173 		rtc_update_irq(mrst->rtc, 1, rtc_intr);  in mrst_checkintr()
209 	if (!mrst->irq)  in mrst_set_alarm()
210 		return -EIO;  in mrst_set_alarm()
212 	hrs = t->time.tm_hour;  in mrst_set_alarm()
213 	min = t->time.tm_min;  in mrst_set_alarm()
214 	sec = t->time.tm_sec;  in mrst_set_alarm()
232 	if (t->enabled)  in mrst_set_alarm()
321 		return -EBUSY;  in vrtc_mrst_do_probe()
324 		return -ENODEV;  in vrtc_mrst_do_probe()
326 	iomem = devm_request_mem_region(dev, iomem->start, resource_size(iomem),  in vrtc_mrst_do_probe()
330 		return -EBUSY;  in vrtc_mrst_do_probe()
341 	mrst_rtc.rtc->ops = &mrst_rtc_ops;  in vrtc_mrst_do_probe()
343 	rename_region(iomem, dev_name(&mrst_rtc.rtc->dev));  in vrtc_mrst_do_probe()
351 		dev_dbg(dev, "TODO: support more than 24-hr BCD mode\n");  in vrtc_mrst_do_probe()
355 					  0, dev_name(&mrst_rtc.rtc->dev),  in vrtc_mrst_do_probe()
373 	dev_err(dev, "rtc-mrst: unable to initialise\n");  in vrtc_mrst_do_probe()
390 	mrst->rtc = NULL;  in rtc_mrst_do_remove()
391 	mrst->dev = NULL;  in rtc_mrst_do_remove()
402 	mrst->suspend_ctrl = tmp = vrtc_cmos_read(RTC_CONTROL);  in mrst_suspend()
418 		mrst->enabled_wake = 1;  in mrst_suspend()
419 		enable_irq_wake(mrst->irq);  in mrst_suspend()
422 	dev_dbg(&mrst_rtc.rtc->dev, "suspend%s, ctrl %02x\n",  in mrst_suspend()
440 	unsigned char tmp = mrst->suspend_ctrl;  in mrst_resume()
442 	/* Re-enable any irqs previously active */  in mrst_resume()
446 		if (mrst->enabled_wake) {  in mrst_resume()
447 			disable_irq_wake(mrst->irq);  in mrst_resume()
448 			mrst->enabled_wake = 0;  in mrst_resume()
460 			rtc_update_irq(mrst->rtc, 1, mask);  in mrst_resume()
466 	dev_dbg(&mrst_rtc.rtc->dev, "resume, ctrl %02x\n", tmp);  in mrst_resume()
479 	return -ENOSYS;  in mrst_poweroff()
486 	return vrtc_mrst_do_probe(&pdev->dev,  in vrtc_mrst_platform_probe()
493 	rtc_mrst_do_remove(&pdev->dev);  in vrtc_mrst_platform_remove()
499 	if (system_state == SYSTEM_POWER_OFF && !mrst_poweroff(&pdev->dev))  in vrtc_mrst_platform_shutdown()